fix(agents): render formatted prompt bubbles

- Render user prompt transcript bubbles through the shared Markdown component so bullets, line breaks, and inline formatting display like normal messages
- Preserve multi-line Buzz event Content fields when parsing ACP prompt payloads, stopping before harness metadata such as Tags and Parsed fields
- Add transcript helper coverage for a multi-line mention prompt to guard against flattening formatted responses back to one line

Author: tellaho

desktop/src/features/agents/ui/AgentSessionTranscriptList.tsx

@@ -291,7 +291,7 @@ function PromptUserMessage({
       />
       <div className="group relative flex max-w-[85%] min-w-0 flex-col items-end gap-1">
         <div className="w-full min-w-0 rounded-2xl bg-muted p-2.5 text-sm leading-relaxed text-foreground">
-          <p className="whitespace-pre-wrap wrap-break-word">{text}</p>
+          <Markdown content={text || " "} tight />
           {contextOpen && context ? (
             <PromptContextSections sections={context.sections} setup={setup} />
           ) : null}
@@ -607,7 +607,7 @@ function MessageItem({
             <Markdown compact content={text || " "} />
           ) : (
             <>
-              <p className="whitespace-pre-wrap wrap-break-word">{text}</p>
+              <Markdown content={text || " "} tight />
               <TranscriptTimestamp timestamp={item.timestamp} />
             </>
           )}

desktop/src/features/agents/ui/agentSessionTranscriptHelpers.test.mjs

@@ -65,6 +65,37 @@ test("parsePromptText extracts content, hex pubkey, and a title-cased kind", ()
   );
 });
 
+test("parsePromptText preserves multiline event content in the user bubble text", () => {
+  const text = [
+    "[Buzz event: @mention]",
+    "Event ID: event-1",
+    "Channel: agents",
+    `From: tho (hex: ${HEX})`,
+    "Time: 2026-06-15T17:15:00Z",
+    "Content: @Ned",
+    "",
+    "- remove that stray cherry pick if it's not adding value here",
+    "- help me understand what that e2eBridge change does",
+    "- we'd want the e2e seed path as a separate pull request",
+    'Tags: [["h","agents"]]',
+    "Parsed: mentions=[Ned]",
+  ].join("\n");
+
+  const result = parsePromptText(text);
+
+  assert.equal(
+    result.userText,
+    [
+      "@Ned",
+      "",
+      "- remove that stray cherry pick if it's not adding value here",
+      "- help me understand what that e2eBridge change does",
+      "- we'd want the e2e seed path as a separate pull request",
+    ].join("\n"),
+  );
+  assert.equal(result.userPubkey, HEX);
+});
+
 test("parsePromptText lowercases the extracted hex pubkey", () => {
   const text = [
     "[Buzz event: dm]",

desktop/src/features/agents/ui/agentSessionTranscriptHelpers.ts

@@ -85,9 +85,39 @@ function parsePromptSections(text: string): PromptSection[] {
   return sections;
 }
 
+const EVENT_CONTENT_BOUNDARY_RE =
+  /^(?:Event ID|Channel|Kind|From|Time|Tags|Parsed):\s*/;
+const EVENT_BLOCK_BOUNDARY_RE = /^--- Event \d+\b/;
+
 function extractEventContent(body: string): string {
-  const contentMatch = body.match(/^Content:\s*(.*)$/m);
-  return contentMatch?.[1]?.trim() ?? "";
+  const lines = body.split(/\r?\n/);
+  const chunks: string[] = [];
+
+  for (let i = 0; i < lines.length; i++) {
+    const match = lines[i].match(/^Content:\s?(.*)$/);
+    if (!match) {
+      continue;
+    }
+
+    const contentLines = [match[1] ?? ""];
+    for (let j = i + 1; j < lines.length; j++) {
+      const line = lines[j];
+      if (
+        EVENT_CONTENT_BOUNDARY_RE.test(line) ||
+        EVENT_BLOCK_BOUNDARY_RE.test(line)
+      ) {
+        break;
+      }
+      contentLines.push(line);
+    }
+
+    const content = contentLines.join("\n").trim();
+    if (content) {
+      chunks.push(content);
+    }
+  }
+
+  return chunks.join("\n\n");
 }
 
 function extractEventAuthorPubkey(body: string): string | null {